Electrically-heated fireless cooker



H. J. PATTERSON. y ELECTRICAL'LY HEATED FIRELESS COOKER.

APPLICATION FILED 0CT=5|1920\ l ,405,624. Patented Feb. 7, 1922.

UNITED STATES PATENT OFFICE.

BALBH J. riifrrnnsoiv, oF isos'roiv,v MASSACHUSETTS.

ELECTRICALLY-HEATED FIREIJESS 'COOKEIL To all whom tf/nag] concern.'

Be it known that I, RALPH J. PATTERSON, a citizen of the United States,residing at Boston, in the county of Suilolk and State of Massachusetts,have invented certain new and useful Improvements in Electrically-Heatedlireless Cookers, of which the following is a specification.

4This invention relates to electric heaters, and more particularly toattachment-s for heating-tireless cookers, and it comprises thecombination oi?Y a heating chamber, av heating element removablyarranged in the chamber, and ay socket for connecting said heatingelement to a Source of current, said socket comprising an outercylindrical meinybei' arranged in one of the walls of the heatingchamber, an insulating bushing .ar- Yranged insaid socket, said bushingbeing l.adapted to: close the opening in the cylindrical member toprevent loss of heat, and

a rod or pin supported in Said bushing and spaced from said cylindricalmember, said cylindrical member and Saidv rod forming' the twocontactsof said socket and being adapted to receive a plug` arranged on the endof the usual electric conducting wires.

Y In the present invention, I have'provided a portable electricalheaterto be used as an attachment for i'ireless cookers and have devised means for delivering current to said heater without permittingthe escape of heat from the heating chamber. lVi-th a heating elementarranged to be heated within the cell of the cooker, `a great saving ofrealt is accomplished. The heating element maybe `First hearted to thedesired ktemperature and the food to be cooked then placed in the cookerinthe same manner that is now employed where the stone is first heatedand then placed in the cooker when the desired temperature is reached. ASingle heating element may be employed to heat one or more compartment-sof the cooker, the heating element being removable.A There a singleheating element is used for one ci' more compartments, the usual soapStones, or other heating bricks, may be employed in connection therewithand the stones heated in a single compartment and then placed in theother compartments. vVhere the heater is used in the compartment inwhich the food is to be cooked, the stone in which the heating elementis embedded and which forms a part of the heating element, retainsSpecification of Letters Patent.

Patented Feb. '7, 1922.

' Application filed October 5, 1920. Serial No. 414,745.

suilicient heat and it is unnecessary to eniploy an auxiliary heatingbrick.

In the present invention, I have provided an improved type of socket'for delivering current to the heating element which is a very simpleconstruction and which conveys the current through the walls of theheating chamber without permitting the escape of heat.

In the accompanying drawings, I have shown one embodiment of theinvention. In this showing,

y Figure l is a Avertical longitudinal sectional view through aifireless cooker showing the improved type of socket.

Figure 2 is aI detailed enlargement showing the sockets arranged in thewall of the cooker, and

Figure 3 is a section on the line 3 3 of Figure 2.

lI'leferi'ing to the drawings, the reference numeral l designatesgenerally a ireless cooker having a plurality of compartments n 2. rIhecooker is provided with outer walls .and inner walls 4t, suitableinsulating material 5 being arranged between the walls ot' the cooker toprevent radiation of heat. Each of the compartments is provided with adoublcwall cover G having suitable heat insulating material 7 arrangedtherebetween.

VThe construction heretofore described is the usual tireless cookerconstruction and forms no part ot the present invent-ion except in thecombination claimed.

An electric heating element 8 of usual construction is adapted to bearranged in the bottom of either of the compartments 2. As shown, theheating element is removably placed in the cooker, resting on the bottomof the compartment and may be readily removed and placed in any of thecompartments. An electric socket is arranged in an openinoin one of thewalls of each compartment. .if-is shown,- the socket comprises an outercylinder member 9 iitting within the opening and forming one of thecontacts of the sockets. An insulating bushing 10 is arranged withinthecylindrical member. As shown, the outer periphery of the bushing isprovided with end flanges il forming a central recess adapted to receivean ainiular projection l2 on the cylindrical member to retain thebushing in position. The bushing lits snugly within the cylindricalmember to prevent escape of heat through the opening.

The 4center contact member comprisesy a pin 13 projecting through thebushing and provided with threads 1e arranged above and below thebushing;V Nuts Y15 are arranged-on these threads whereby the centercontactmember is held in position. Current is delivered to the socketvfrom any suitable source by lead wires 16 andplug 17 and is conductedto the electric" heater from 'the other end of the socket by plug 18 andleadrwires 19. `The lead wires `19 are connected to the electric heatingelement in any suitable manner (not 'ner metallic conducto-r 21.V

shown) .p Each of the plugs is providedwith an insulating member 20, su*porting an inne of the lead wiresis connected to the outer shell of the4plug which contacts with the cylindrical member r9, and the other vWireto the shell 21 which contacts with'the central contact inember Vof thesocket. Y A

The operation of the device'will be apparent to those skilled inthe art.The heatingy element is arranged in one of the cells or compartments ofthe iireless cooker andi connected tothe socketfby means oitV lead wires19 and plug 18. "The socket is similai-ly connectedv to a source ofcurrent by means of plug 17 and lead wires 16. Current isallowed to iowfor suicient time to 30V.Y

- temperature V.and the cooker is then emheat the heating element 8 tothe desired partment of the cooker. Under some conditions it isadvisable to arrange heating elements above and below the substance tobe cooked.l Under such-conditions, an additional heating .element (notshown) isy arrang-ed on top of apan or otherrecept-acle (not shown) inthe compartment or the cooker, and this heating element is connected tothe second socket in the-*manner heretofore described.V 1 'Y Y It is tobe understood that, while I have Vdescribed the preferred embodiment ofmy invention, variouschanges in the shape, size,

land arrangementjof parts may be resorted to without departing from thespirit of the in- `Vvention or the scope of the subj o ined claims.

'Y Having thus described my invention, I claim: Y

. 1. The combination with a tireless cooker anda heating elementarranged therein, of a socket arranged in one of the walls of thecooker, said wall beingprovided with an opening, said socket comprisingan outer cylindrical member arranged in the'wall, an insulating bushingarrangedin said outer cylin-` drical member and adapted to prevent lossof heat from the cooker,l a central contact member supported `l withinsaid i bushing, Y

` means for electrically connecting said socket to a source offcurrent,and means for electrically connecting said heating element to saidVsocket.` Y Y ,l A

2. The combination with a ireless'cooker having an opening arranged inone wall and an electric heating element arrangedin said cooker, ofanfelectric socket comprising an outer cylindrical member arranged insaid opening, said outer'cylindrical member :be-

ing provided withan annular enlargement,

an insulating bushing disposed in said cylindrical member and supportedon said `enlargement, said insulating `member being yadapted to preventlossof heat fromV said chamber, and a central contact member supportedin' said'insulated bushing and projecting abovel and below the same,means for delivering current to said socket, and Vmeans tor deliveringcurrent .from said socket toi said electric heating element,

havin@- an o eninO' in one `wall of an electric drical member andadaptedV to close said opening, a second contact supported in saidbushing and'projecting above and below the same, said second contactbeing provided with spaced threaded portions tolretain said member inposition, means ffor Vconveying Ycurrent to said socket, a heatingelement ar- 3. The combination witha tireless cooke Y 9.0 socketarrangedV therein comprising anouter Y i cylindrical member forming oneContact, an-` insulating bushing` arranged in vsaid cylin- Y rangedinsaid cooker, and means orconveyf ing current from element.: l Y Y Intestimony whereof I affix-may signature inpresence ot two witnesses.

said socket to said heating Witnesses Y,

C. N. PERKINS, THOMAS N. W Emis.

'RALPH J. inuuiansoii.,V

